Meta Object Protocol The essence of a Metaobject Protocol is simple: every aspect of a program's mapping down onto the lower level substrate (i.e. its compilation and runtime support) is controlled by some object or set of objects following a well-defined protocol. These objects are called metaobjects, because they are about the mapping of the program, rather than objects in the program's primary subject domain. Client programmers can replace one or more of these objects with specialized ones to affect specific aspects of the implementation of specific parts of their program. Also see Andreas Paepcke, "User-Level Language Crafting": How about: make your interpreter (or compiler) available in your program, so that you can change rules for method lookup, variable scoping or whatever else you want in your program. Let me take my stab, having (tried to) read the book:
World's Top Financial Centers - London's Finance Lead Nearly all of the world's financial centers have rebounded from the financial crisis, but the gains have not been experienced equally across cities, a new ranking of global financial hubs suggests. The biannual study, commissioned by the City of London and conducted by Z/Yen Group Ltd, ranks financial centers using data from a survey of international financial services professionals as its criteria. In its latest incarnation, the GFC 7, the report indicates a growing confidence among the financial services community in the health and stability of the financial districts around the world, with 71 out the 75 included in the assessment experiencing an increase in their ratings. Indeed, the assessment seems to reflect a shift away from the top two twin cities toward other, new focal points: even as several cities saw their scores creep up, the top two financial hubs hovered roughly around their scores from the previous survey, narrowing the gap between the long-time leaders and the rest.
Aspect-oriented software development Traditional software development focuses on decomposing systems into units of primary functionality, while recognizing that there are other issues of concern that do not fit well into the primary decomposition. The traditional development process leaves it to the programmers to code modules corresponding to the primary functionality and to make sure that all other issues of concern are addressed in the code wherever appropriate. Programmers need to keep in mind all the things that need to be done, how to deal with each issue, the problems associated with the possible interactions, and the execution of the right behavior at the right time. These concerns span multiple primary functional units within the application, and often result in serious problems faced during application development and maintenance. History Currently, several aspect-oriented programming languages are available for a variety of languages and platforms. Motivation Crosscutting concerns Overview
Open Knowledge: Changing the Global Course of Learning Why should I take this course? The course will be a global conversation on openness that cuts across borders, cultures, disciplines, and professions. It will help prepare you in becoming an informed, critical, and connected digital citizen, actively participating in the consumption and production of the world's knowledge. How much of a time commitment will this course be? You will be able to choose from a sliding scale of participation that best meets your learning needs, ranging from about 1 hour per week up to 8 hours per week. Do I need to buy a textbook? There is no textbook for this course. Will the weekly module content be available after the course formally ends? Yes, the instructors are committed to keeping the weekly modules openly available, although the forums will not be monitered. Will I get a Statement of Accomplishment? Yes, students will be eligible for a statement of accomplishment. John Willinsky Arianna Becerril García Samuel Smith Esseh Lauren Maggio Bozena Mierzejewska Dr.
Inc Products: The Meta-Object Protocol and Knowledge-Based Systems December 1997 This is the latest in a series of articles on developing Knowledge-Based Applications with Dynamic Objects technology. The first of these articles, Knowledge-Based Application Development with Dynamic Objects Technology (October 1997), discussed what kind of applications are included in this category, how they are being integrated into multi-tier client-server computing architectures, and how Allegro CL has become the "tool of choice" for development of knowledge-based systems. The article Dynamic Objects Features Make Allegro CL Ideal for Knowledge-Based Applications (November 1997) focused on one of the Dynamic Objects features of Allegro CL which makes it ideal for this kind of development: the capability of Allegro CL to runtime-extend and reconfigure knowledge very efficiently. In this article, we take a look at another of the key features of Allegro CL which makes it ideal for knowledge-based applications development: the Meta-Object Protocol. Note: Uniform Syntax